The shape of arrangement of xylem vessels in monocot stem

Options

A. Y-shaped
B. X-shaped
C. Long, tubular
D. S-shaped

Answer

To determine the shape of the arrangement of xylem vessels in a monocot stem, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Xylem**:
- Xylem is composed of various components, including vessels, tracheids, xylem parenchyma, and fibers. In monocots, the arrangement of these components is distinct compared to dicots.

2. **Identify the Arrangement in Monocots**:
- In monocot stems, the xylem vessels are typically arranged in a specific pattern. This arrangement is crucial for the plant's water transport system.

3. **Examine the Shape of Xylem Vessels**:
- The xylem vessels in monocots are often described as being "Y-shaped." This means that the vessels branch out in a Y-like formation, which is characteristic of monocotyledonous plants.

4. **Recognize the Components of the Y-Shape**:
- The Y-shaped vessels consist of larger, rounded metaxylem vessels that form the arms of the "Y," while the protoxylem vessels form the base of the "Y."

5. **Conclude the Answer**:
- Based on the arrangement and shape of the xylem vessels in monocot stems, the correct answer to the question is that the xylem vessels are arranged in a "Y-shaped" formation.

### Final Answer:
The shape of the arrangement of xylem vessels in a monocot stem is **Y-shaped**.

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